Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff6a402233e2f2e…

MALICIOUS

PDF

93.5 KB Created: 2021-09-04 02:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 13309cc387bb3576b7d14f794ee7d9b2 SHA-1: 2f5e6b7301d547ff5e9938733be465d1362573eb SHA-256: 1ff6a402233e2f2eb29e5f98208c280ae5f3ce7e11531f8cf20fd9b5941d5bf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest the primary goal is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=teori+health+belief+model+pdf PDF link annotation
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3a583191c24ad0c1274e09fd6ff52ad7/163945547.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/4f26a4463c59db4fdecf09fbd9e4b47c/72768609310.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db5c439e189---28471628264.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/84545029972.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/58578825632.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/takaw.pdfIn PDF document text
    • https://lordpin.com/calisma2/files/uploads/81753760093.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5e2373dca---sevewa.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607824b9e1762---vovuxebumibepuze.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/9255681186.pdfIn PDF document text
    • https://breedlife.com/upload/files/57121845710.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/84765330815.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jtnn9gqeve7kbvodcbvtmepblu/32489442710.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/37a65c825bc9e85cf926c2680211b64b/gubuzulejif.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/e6c66eab68a03bbfb607cedd3f8d7c6b/konepigizututibewa.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612e58409107f---91437471539.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073147d06c6c---62144093435.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3dcd1468c---72947081640.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/71750225286.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/fatududefekunixo.pdfIn PDF document text
    • http://c-amc.com/upload/files/85979683998.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9ea55befb---95032084678.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f47518af53---bexunovavobuborixatif.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 19296 bytes
SHA-256: d3dd9d86e469a8ef71d5a7175f8ecad25cda5d2dbbbc5a5254baaef5fd5348bb
font_01_sfnt_off00013894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13894 10596 bytes
SHA-256: 811c07c3c3e29c1183b33425b9d56e6d9517d1c62529b288fe89363e7320a7ff
font_02_sfnt_off0001507e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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